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| The Nature of Forces Chapter 2 Notes Section 2-3 Page 3 |
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| 2-3 Newton's Laws of Motion Objectives: -Explain the property of inertia -Describe Newton's three laws of motion -Relate force, mass, and acceleration Vocabulary: Inertia- Property of matter that tends to resist any change in motion. Newton- Unit of Force, 1kg x 1m/sec/sec = 1 Newton (N) - Sir Isaac Newton developed three laws that describe all the states of motion: rest, constant motion, and accelerated motion. Newton' First Law of Motion: An object at rest will remain at rest and an object in motion will remain in motion at a constant velocity unless acted upon by an unbalanced force. (Push Pull) - The Greeks believed that in order to set in object in motion, a force had to be exerted on the object and if that force was removed, the object would come to rest. - The Greeks were wrong! What brings an object to rest is friction. - Newton recognized that if friction was not present, an object in motion would continue to move forever. And an object at rest would continue to stay at rest unless it was acted upon by an outside unbalanced force. - The tendency of objects to remain in motion or stay at rest is inertia. - Newton's 1st Law tells us that acceleration and forces are related. There is only acceleration in the presence of force. |
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